Measurement and Instrumentation
Consider the following statement - 1. The compensating coil of a low power factor wattmeter compensates the effect of the impedance of the current coil. 2. The compensating coil of a low power factor wattmeter compensates the effect of the impedance of the voltage coil circuit.

 1 is true but 2 is false.
 Both 1 and 2 are true.
  1 is false but 2 is true.
 Both 1 and 2 are false.

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Measurement and Instrumentation
In DC potentiometer measurments, a second reading is often taken after reversing the polarities of the DC supply and the unknown voltage and the average of the two reading is taken. This is with a view of eliminate the effects of

  Stray thermal emfs.
 Errorneous standardisation.
 Stray magnetic fields.
 Ripples of the DC supply.

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